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Related Experiment Videos

Correlation between electroencephalography and heart rate variability during sleep.

Mina Ako1, Tokuhiro Kawara, Sunao Uchida

  • 1Biofunctional Informatics, Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Department of Sleep Disorders Research, Tokyo Japan.

Psychiatry and Clinical Neurosciences
|January 10, 2003
PubMed
Summary
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Autonomic nervous activity, measured by electroencephalogram (EEG) and heart rate variability (HRV), fluctuates with sleep stages. Sympathetic activity decreases with deeper sleep, indicated by delta EEG power.

Area of Science:

  • Neuroscience
  • Sleep Science
  • Autonomic Nervous System Research

Background:

  • Autonomic nervous activity is known to vary with sleep stages.
  • Detailed characteristics of continuous nocturnal autonomic nerve tone fluctuations remain unclear.

Purpose of the Study:

  • To investigate the correlation between electroencephalogram (EEG) and autonomic nervous activities.
  • To elucidate the detailed nocturnal fluctuations in autonomic nervous activities during sleep.

Main Methods:

  • Overnight EEG and electrocardiograms were recorded from seven healthy males.
  • EEG power spectra (delta, sigma, beta) and heart rate variability (HRV) indices (LF, HF, LF/HF ratio) were analyzed.
  • Sleep stages were manually scored, and correlations between EEG and HRV parameters were assessed.

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Main Results:

  • Low frequency (LF) and LF/HF ratio were significantly lower during non-rapid eye movement (NREM) sleep compared to REM sleep.
  • LF and LF/HF ratio decreased across NREM stages, being lowest in stages 3 and 4.
  • Delta EEG power showed significant inverse correlations with LF and LF/HF ratio, particularly during lighter NREM stages.

Conclusions:

  • Sympathetic nervous activity continuously fluctuates in relation to sleep depth, decreasing as sleep deepens.
  • Delta EEG power serves as an indicator of changing sympathetic nervous activity during sleep cycles.
  • Heart rate variability metrics provide insights into the dynamic regulation of the autonomic nervous system during sleep.